EP1186816B1 - Solenoid valve - Google Patents

Solenoid valve Download PDF

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Publication number
EP1186816B1
EP1186816B1 EP01201949A EP01201949A EP1186816B1 EP 1186816 B1 EP1186816 B1 EP 1186816B1 EP 01201949 A EP01201949 A EP 01201949A EP 01201949 A EP01201949 A EP 01201949A EP 1186816 B1 EP1186816 B1 EP 1186816B1
Authority
EP
European Patent Office
Prior art keywords
closure member
core
solenoid valve
solenoid
fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01201949A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1186816A3 (en
EP1186816A2 (en
Inventor
Marco Liorati
Daniele Zaupa
Bruno Giordano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brahma SpA
Original Assignee
Brahma SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Brahma SpA filed Critical Brahma SpA
Publication of EP1186816A2 publication Critical patent/EP1186816A2/en
Publication of EP1186816A3 publication Critical patent/EP1186816A3/en
Application granted granted Critical
Publication of EP1186816B1 publication Critical patent/EP1186816B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0644—One-way valve
    • F16K31/0655—Lift valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0644—One-way valve
    • F16K31/0651—One-way valve the fluid passing through the solenoid coil
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/005—Regulating fuel supply using electrical or electromechanical means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7758—Pilot or servo controlled
    • Y10T137/7759—Responsive to change in rate of fluid flow
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7758—Pilot or servo controlled
    • Y10T137/7761—Electrically actuated valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87917—Flow path with serial valves and/or closures
    • Y10T137/87981—Common actuator

Definitions

  • the present invention relates to solenoid valves and, more particularly, to a solenoid valve for delivering a fluid at a variable flow-rate, of the type defined in the preamble of Claim 1 and as disclosed, for example, in the closest prior art document EP-A-0 676 589.
  • Solenoid valves of this type are used widely in gas-burner supply systems, for regulating the input gas-flow and thus modulating the production of heat by the burner.
  • a typical known solenoid valve comprises a hollow metal body with an inlet connector and an outlet connector with a valve seat, and a closure member movable along an axis perpendicular to the flow of the fluid.
  • the closure member is connected or otherwise mechanically coupled to a ferromagnetic core which forms part of a magnetic circuit activated by a solenoid mounted on the body.
  • valve seat and the closure member are shaped in a manner as to define between them an aperture the size of which is variable continuously from zero, that is, from a position in which the flow of fluid is blocked, to a maximum value, that is, to a position in which the fluid has the maximum flow-rate, in dependence on an electrical control quantity, usually the current passing through the solenoid.
  • Flow-rate regulating means may also be provided to ensure stable positioning of the closure member at all points of its travel and gradual movement of the closure member, without hysteresis.
  • the hollow body is generally made of a ferrous alloy, by pressing or die-casting, and has structural and dimensional characteristics such as to ensure the necessary torsional and bending strength. It is generally quite heavy and bulky and constitutes a fairly expensive part of the solenoid valve.
  • the adjustment means also constitute a critical part of the solenoid valve since they are often quite complex, requiring particular care and tight manufacturing tolerances, particularly when they comprise hydraulic position-control systems.
  • the main object of the present invention is to provide a solenoid valve which does not have a conventional body such as that described above and which is therefore less bulky and expensive than known solenoid valves.
  • a valve comprises two cylindrical elements 20 and 21, fitted in a leaktight manner in a sheath 22 of non-ferromagnetic material, and a ferromagnetic core 23 slidable in the sheath between the two elements 20 and 21.
  • the elements 20 and 21 have coaxial through-holes 24 and 25 which are enlarged outwardly to form the inlet opening 26 and the outlet opening 27 of the valve, respectively.
  • the element 20 with the inlet opening or, briefly, the inlet element 20, is made of ferromagnetic material and the element 25 with the outlet opening or, briefly, the outlet element 25, may equally well be made of non-ferromagnetic material, for example, brass, or of ferromagnetic material.
  • a solenoid 28 surrounds the sheath 22 and parts of the elements 20 and 21 and a cylindrical shell 29 surrounds the solenoid 28.
  • the parts of the valve described above are held together by a support structure which, in this embodiment, comprises two discs 30, 31 and two bolts 34, 35.
  • the two discs 30 and 31, which are made of ferromagnetic material and have central holes through which the end portions of the two elements 20 and 21 extend, are in contact with respective annular abutments 32, 33 of the two elements 20 and 21.
  • the two bolts 34 and 35 are inserted in holes provided in opposed radial projections of the discs 30 and 31 and hold the various structural parts of the valve together, ensuring the necessary torsional and bending strength.
  • the core 23 is formed as a piston which is movable in the cylindrical chamber defined by the sheath 22 and divides this chamber into two compartments 36, and 37.
  • the two compartments 36 and 37 communicate with one another through holes in the core 23, that is, in this embodiment, an axial hole 38 and radial holes 39.
  • a closure member 40 which, in this embodiment, is made of rubber or other elastomeric material, has a frustoconical end and is fixed firmly to the core 23.
  • the axial hole 25 in the element 21 is flared towards the inside of the compartment 37 and forms a valve seat 41 having a conical surface which mates with the conical surface of the closure member 40 when the latter is in the valve-closure position.
  • the portion of the core 23 remote from the closure member 40 has a cavity, also with a frustoconical surface, which mates with a corresponding surface of the inner end 42 of the inlet element 20 when the core 23 is in the position in which the valve is fully open.
  • a spring 43 housed in a cavity in the inner end 42 of the inlet element 20, bears on the facing surface of the core 23 so as to keep the closure member in the closure position, in the absence of other forces.
  • the closure member 40 moves away from the valve seat 41. If the inlet element 20 is connected to a gas-supply pipe, the gas can pass through the axial hole 24 of the inlet element 20, the compartment 36, the holes in the core, the compartment 37 and the aperture formed between the closure member 40 and the valve seat 41 by virtue of the displacement of the core 23, to reach the valve-outlet opening 27.
  • the size of the aperture is determined by the current flowing through the solenoid and, more precisely, by the current for which the axial component of the force induced in the core 23 is in equilibrium with the resilient force of the spring 43.
  • the axial component of the force induced increases gradually and substantially in proportion to the electrical control quantity.
  • Figure 2 is a graph which shows, by way of example, how the pressure Pout, and hence the flow-rate, of the gas output varies as a function of the current I flowing through the solenoid.
  • the curve indicated A relates to an opening operation and the curve indicated B relates to a closure operation.
  • the configuration of the valve with the closure member movable along the same axis as the flow of fluid makes it possible to do without a conventional valve body and thus to save the production costs thereof.
  • the saving is even more appreciable by virtue of the fact that the main parts of the valve can easily be produced by inexpensive turning operations.
  • the necessary torsional and flexural stiffness are ensured by the support and fixing structure composed of the two opposed discs and of the two bolts.
  • FIG 3 in which parts identical or equivalent to those of Figure 1 are indicated by the same reference numerals, shows a solenoid valve with two closure members which is usable advantageously as a regulation and safety valve for the supply of a gas installation in which a so-called double gas seal is required, for example, a domestic water-heater.
  • the inlet element is divided into two portions: a first portion, which is made of non-ferromagnetic material and indicated 20', and which basically has the function of an inlet connector, and a second portion, which is made of ferromagnetic material and indicated 20'' and is separated from the first portion by a cylindrical chamber 50.
  • a second closure member, housed slidably in the chamber 50, is constituted by a sealing member which, in this embodiment, is a rubber disc 52, fixed to one end of a core 51 of ferromagnetic material with radial grooves or axial holes (not visible in the drawing).
  • a spring 53 inside the chamber 50 urges the core 51 towards the portion 20'' so that, in the absence of other forces, the rubber disc 52 closes the valve seat 54 defined by the end of the axial hole in the portion 20'' of the inlet element.
  • the solenoid 28 When the solenoid 28 is energized, the core 51 moves, overcoming the resilient force of the spring 53 and opening the passageway for the gas towards the axial hole in the portion 20''.
  • the spring 53 selected is such that the core 51 moves to the open position, that is, to the position in which the disc 52 is removed from the valve seat 54, at the latest, at the moment at which the regulation valve with the movable core 23 starts to open.
  • the second seal ensured by the second closure member 52 constitutes a safety measure, should the closure member 40 stick in the open position for any reason.
  • FIG. 5 A particularly advantageous method of regulating the flow-rate of a solenoid valve according to the invention is shown in Figure 5.
  • a small turbine 60 is mounted at the output of the solenoid valve and rotates at a speed variable with the output gas flow-rate.
  • At least one magnet is encapsulated in the turbine.
  • a Hall-effect sensor 61 generates an electrical signal proportional to the speed of the turbine.
  • An electronic control unit 62 compares the information coming from the sensor 61 with a reference quantity Qref corresponding to a predetermined flow-rate and causes the supply current I of the solenoid to vary so as to keep the output gas-flow stable at the predetermined flow-rate.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Magnetically Actuated Valves (AREA)
  • Valve Device For Special Equipments (AREA)
EP01201949A 2000-09-08 2001-05-23 Solenoid valve Expired - Lifetime EP1186816B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2000RM000484A IT1316202B1 (it) 2000-09-08 2000-09-08 Elettrovalvola per erogazione a portata variabile di un fluido.
ITRM000484 2000-09-08

Publications (3)

Publication Number Publication Date
EP1186816A2 EP1186816A2 (en) 2002-03-13
EP1186816A3 EP1186816A3 (en) 2002-12-11
EP1186816B1 true EP1186816B1 (en) 2006-02-15

Family

ID=11454905

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01201949A Expired - Lifetime EP1186816B1 (en) 2000-09-08 2001-05-23 Solenoid valve

Country Status (6)

Country Link
US (1) US6725877B2 (it)
EP (1) EP1186816B1 (it)
AT (1) ATE317955T1 (it)
DE (1) DE60117219T2 (it)
DK (1) DK1186816T3 (it)
IT (1) IT1316202B1 (it)

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JP2005291411A (ja) * 2004-04-01 2005-10-20 Toyoda Mach Works Ltd 過流防止弁
US11906988B2 (en) 2006-03-06 2024-02-20 Deka Products Limited Partnership Product dispensing system
US9146564B2 (en) 2006-03-06 2015-09-29 Deka Products Limited Partnership Product dispensing system
ES1062961Y (es) * 2006-05-16 2006-12-01 Coprecitec Sl Grifo de gas rotatorio con una valvula electromagnetica integrada
DE102006044765A1 (de) * 2006-09-20 2008-04-03 Wabco Gmbh Zweistufiges Magnetventil für eine elektropneumatische Ventilsteuereinheit
EP2115335B1 (en) * 2007-01-22 2016-04-13 IMI Webber Limited One-piece metal orifice tube and solenoid valve including a one-piece metal orifice tube
PL1975486T3 (pl) * 2007-03-28 2015-05-29 Fillon Tech Sas Societe Par Actions Simplifiee Zawór dozujący
US11634311B2 (en) 2007-09-06 2023-04-25 Deka Products Limited Partnership Product dispensing system
US10562757B2 (en) 2007-09-06 2020-02-18 Deka Products Limited Partnership Product dispensing system
US10859072B2 (en) 2007-09-06 2020-12-08 Deka Products Limited Partnership Product dispensing system
JP4701227B2 (ja) * 2007-10-29 2011-06-15 日立オートモティブシステムズ株式会社 プランジャ式高圧燃料ポンプ
US20090165866A1 (en) * 2007-12-28 2009-07-02 Giovanni Fima Valve With Built-In Sensor
GB2460022B (en) * 2008-05-12 2010-04-07 Siemens Magnet Technology Ltd Passive overpressure and underpressure protection for a cryogen vessel
US8763655B2 (en) 2008-05-20 2014-07-01 Grinon Industries Fluid transfer assembly and methods of fluid transfer
US8777182B2 (en) 2008-05-20 2014-07-15 Grinon Industries Fluid transfer assembly and methods of fluid transfer
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US8408516B2 (en) * 2009-04-27 2013-04-02 GM Global Technology Operations LLC Fluid pressure control device with integrated pressure sensor
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US9599997B2 (en) * 2014-11-14 2017-03-21 Honeywell International Inc. Feedback-controlled fluid valve
US11135345B2 (en) 2017-05-10 2021-10-05 Fresenius Medical Care Holdings, Inc. On demand dialysate mixing using concentrates
US11504458B2 (en) 2018-10-17 2022-11-22 Fresenius Medical Care Holdings, Inc. Ultrasonic authentication for dialysis
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US11946565B2 (en) 2021-02-25 2024-04-02 Hayward Industries, Inc. Valve assembly
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Also Published As

Publication number Publication date
DE60117219D1 (de) 2006-04-20
US6725877B2 (en) 2004-04-27
ATE317955T1 (de) 2006-03-15
IT1316202B1 (it) 2003-04-03
US20020029804A1 (en) 2002-03-14
EP1186816A3 (en) 2002-12-11
ITRM20000484A1 (it) 2002-03-08
DE60117219T2 (de) 2006-08-24
DK1186816T3 (da) 2006-06-19
EP1186816A2 (en) 2002-03-13
ITRM20000484A0 (it) 2000-09-08

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